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English definition of “buck (sb/sth) up”

buck (sb/sth) up

UK informal phrasal verb with buck     /bʌk/ verb [I]
to become happier or more positive or to make someone happier or more positive: Oh, buck up for heaven's sake, Anthony! I'm sick of looking at your miserable face. She was told that if she didn't buck her ideas up (= start working in a more positive way), she'd be out of a job. A week at the beach will buck her up.Causing pleasureFeeling pleasure and happinessTaking pleasure in something
(Definition of buck (sb/sth) up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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